unpack-bootstrap-tools: remove obsolete linker script patching

The linker scripts no longer contain store paths, so this does nothing. More
importantly, libpthread.so is not longer a linker script on ARM, so the patching
would corrupt it.

pkgs/stdenv/linux/bootstrap-tools/scripts/unpack-bootstrap-tools.sh

@@ -35,12 +35,7 @@ for i in $out/lib/librt-*.so $out/lib/libpcre*; do
     $out/bin/patchelf --set-rpath $out/lib --force-rpath "$i"
 done
 
-# Fix the libc linker script.
 export PATH=$out/bin
-cat $out/lib/libc.so | sed "s|/nix/store/e*-[^/]*/|$out/|g" > $out/lib/libc.so.tmp
-mv $out/lib/libc.so.tmp $out/lib/libc.so
-cat $out/lib/libpthread.so | sed "s|/nix/store/e*-[^/]*/|$out/|g" > $out/lib/libpthread.so.tmp
-mv $out/lib/libpthread.so.tmp $out/lib/libpthread.so
 
 # Provide some additional symlinks.
 ln -s bash $out/bin/sh